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Ipinza-Concha BM, Dibona-Villanueva L, Fuentealba D, Pinilla-Quispe A, Schwantes D, Garzón-Nivia MA, Herrera-Défaz MA, Valdés-Gómez HA. Effect of Chitosan-Riboflavin Bioconjugate on Green Mold Caused by Penicillium digitatum in Lemon Fruit. Polymers (Basel) 2024; 16:884. [PMID: 38611142 PMCID: PMC11013941 DOI: 10.3390/polym16070884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Revised: 03/11/2024] [Accepted: 03/14/2024] [Indexed: 04/14/2024] Open
Abstract
Penicillium digitatum is the causal agent of green mold, a primary postharvest disease of citrus fruits. This study evaluated the efficacy of a novel photoactive chitosan-riboflavin bioconjugate (CH-RF) to control green mold in vitro and in lemon fruit. The results showed total inhibition of P. digitatum growth on APDA supplemented with CH-RF at 0.5% (w/v) and a significant reduction of 84.8% at 0.25% (w/v). Lemons treated with CH-RF and kept under controlled conditions (20 °C and 90-95% relative humidity) exhibited a noteworthy reduction in green mold incidence four days post-inoculation. Notably, these effects persisted, with all treatments remaining significantly distinct from the control group until day 14. Furthermore, CH-RF showed high control of green mold in lemons after 20 days of cold storage (5 ± 1 °C). The disease incidence five days after cold storage indicated significant differences from the values observed in the control. Most CH-RF treatments showed enhanced control of green mold when riboflavin was activated by white-light exposure. These findings suggest that this novel fungicide could be a viable alternative to conventional synthetic fungicides, allowing more sustainable management of lemon fruit diseases.
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Affiliation(s)
- Brenda M. Ipinza-Concha
- Facultad de Agronomía y Sistemas Naturales, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile; (B.M.I.-C.)
| | - Luciano Dibona-Villanueva
- Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Denis Fuentealba
- Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Alexander Pinilla-Quispe
- Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Daniel Schwantes
- Facultad de Agronomía y Sistemas Naturales, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile; (B.M.I.-C.)
- Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
- Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - María A. Garzón-Nivia
- Facultad de Agronomía y Sistemas Naturales, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile; (B.M.I.-C.)
| | - Mario A. Herrera-Défaz
- Facultad de Agronomía y Sistemas Naturales, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile; (B.M.I.-C.)
| | - Héctor A. Valdés-Gómez
- Facultad de Agronomía y Sistemas Naturales, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile; (B.M.I.-C.)
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2
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Ojeda A, Cofré V, Melo F, Caballero L, Fuentealba D, Cornejo A. α-Synuclein Drives Tau's Cytotoxic Aggregates Formation through Hydrophobic Interactions. Chempluschem 2023; 88:e202300257. [PMID: 37708459 DOI: 10.1002/cplu.202300257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 09/13/2023] [Accepted: 09/14/2023] [Indexed: 09/16/2023]
Abstract
Tau and α-synuclein are proteins involved in pathologies known as tauopathies and synucleinopathies, respectively. Moreover, evidence shows that there is a crosstalk between them as is seen in the brains of individuals with sporadic neurodegenerative disorders. Based on that, we present data showing that the hydrophobic α-peptide 71 VTGVTAVAQKTV82 induces the aggregation of the full-length tau fragment in the absence of heparin assessed by ThT. Moreover, AFM images reveal the presence of straight filaments and amorphous aggregates of full-length tau in the presence of the α-peptide. Additionally, ITC experiments showed the interaction of the α-peptide with tau full-length (441 amino acids),4R (amino acids from 244 to 369), and both hexapeptides 275 VQIINK280 and 306 VQIVYK311 through hydrophobic interactions. The Raman spectroscopy spectra showed conformational changes in the Amide region in the aggregates formed with full-length tau and α-syn peptide. Furthermore, the incubation of extracellular aggregates with N2a cells showed morphological differences in the cellular body and the nucleus suggesting cell death. Moreover,, the incubation of different types of aggregates in cell culture provokes the release of Lactate dehydrogenase (LDH). Altogether, we found that α-synuclein peptide can drive the aggregation of full-length tau-provoking morphological and structural changes evoking cytotoxic effects.
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Affiliation(s)
- Ana Ojeda
- Escuela de Tecnología Médica, Universidad Andrés Bello, Echaurren 183, 8370071 Laboratorio Catem V., Santiago, Chile
| | - Valentina Cofré
- Escuela de Tecnología Médica, Universidad Andrés Bello, Echaurren 183, 8370071 Laboratorio Catem V., Santiago, Chile
| | - Francisco Melo
- Departamento de Física, Universidad de Santiago, Avenida Ecuador 3493, 9170124, Santiago, Chile
- Center for Soft Matter Research, SMAT-C Usach, Avenida Bernardo O'Higgins, 3363 Estación Central, Santiago, Chile
| | - Leonardo Caballero
- Departamento de Física, Universidad de Santiago, Avenida Ecuador 3493, 9170124, Santiago, Chile
- Center for Soft Matter Research, SMAT-C Usach, Avenida Bernardo O'Higgins, 3363 Estación Central, Santiago, Chile
| | - Denis Fuentealba
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Pontificia Universidad Católica de Chile Macul, 7820436, Santiago, Chile
| | - Alberto Cornejo
- Escuela de Tecnología Médica, Universidad Andrés Bello, Echaurren 183, 8370071 Laboratorio Catem V., Santiago, Chile
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Gajardo G, Córdoba A, Forero A, Fuentealba D, Ramírez O, Bonardd S, Toro-Labbé A, Leiva A, Díaz DD, Saldías C. Photoswitching/back-switching assessment of biobased cellulose acetate/azobenzene handleable films under visible-light LED irradiation. Int J Biol Macromol 2023:124883. [PMID: 37201890 DOI: 10.1016/j.ijbiomac.2023.124883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 05/04/2023] [Accepted: 05/11/2023] [Indexed: 05/20/2023]
Abstract
The light-induced processes performed by photofunctional polymer films are crucial aspects of developing integrated energy storage devices properly. Herein, we report the preparation, characterization, and study of the optical properties of a series of biobased cellulose acetate/azobenzene (CA/Az1) handleable films at different compositions. The photoswitching/back-switching behavior of the samples was investigated using varied LED irradiation sources. Additionally, poly(ethylene glycol) (PEG) was deposited onto cellulose acetate/azobenzene films to study the back-switching process's effect and nature in the fabricated films. Interestingly, the melting enthalpies of PEG before and after being irradiated with blue LED light were 2.5 mJ and 0.8 mJ, respectively. Conveniently, FTIR and UV-visible spectroscopy, thermogravimetry (TGA), contact angle, differential scanning calorimetry (DSC), polarized light microscopy (PLM), and atomic force microscopy (AFM) were used for the characterization of the sample films. Complementarily, theoretical electronic calculations provided a consistent approach to the energetic change in the dihedral angles and non-covalent interaction for the trans and cis isomer in the presence of cellulose acetate monomer. The results of this study revealed that CA/Az1 films are viable photoactive materials displaying handleability attributes with potential uses in harvesting, converting, and storing light energy.
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Affiliation(s)
- G Gajardo
- Departamento de Química Física, Facultad de Química y Farmacia, Pontificia Universidad Católica de Chile, Macul, 7820436 Santiago, Chile
| | - A Córdoba
- Departamento de Química Física, Facultad de Química y Farmacia, Pontificia Universidad Católica de Chile, Macul, 7820436 Santiago, Chile
| | - A Forero
- Departamento de Química Física, Facultad de Química y Farmacia, Pontificia Universidad Católica de Chile, Macul, 7820436 Santiago, Chile
| | - D Fuentealba
- Departamento de Química Física, Facultad de Química y Farmacia, Pontificia Universidad Católica de Chile, Macul, 7820436 Santiago, Chile
| | - O Ramírez
- Departamento de Química Física, Facultad de Química y Farmacia, Pontificia Universidad Católica de Chile, Macul, 7820436 Santiago, Chile; Instituto Universitario de Bio-Organica Antonio Gonzalez, Universidad de La Laguna, Avda. Astrofísico Francisco Sanchez 2, 38206 La Laguna, Tenerife, Spain; Departamento de Química Organica, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Macul, 7820436 Santiago, Chile
| | - S Bonardd
- Instituto Universitario de Bio-Organica Antonio Gonzalez, Universidad de La Laguna, Avda. Astrofísico Francisco Sanchez 2, 38206 La Laguna, Tenerife, Spain; Departamento de Química Organica, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Macul, 7820436 Santiago, Chile
| | - A Toro-Labbé
- Departamento de Química Física, Facultad de Química y Farmacia, Pontificia Universidad Católica de Chile, Macul, 7820436 Santiago, Chile
| | - A Leiva
- Departamento de Química Física, Facultad de Química y Farmacia, Pontificia Universidad Católica de Chile, Macul, 7820436 Santiago, Chile
| | - D Díaz Díaz
- Instituto Universitario de Bio-Organica Antonio Gonzalez, Universidad de La Laguna, Avda. Astrofísico Francisco Sanchez 2, 38206 La Laguna, Tenerife, Spain; Departamento de Química Organica, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Macul, 7820436 Santiago, Chile; Institut für Organische Chemie, Universitat Regensburg, Universitatsstr. 31, 93053 Regensburg, Germany.
| | - C Saldías
- Departamento de Química Física, Facultad de Química y Farmacia, Pontificia Universidad Católica de Chile, Macul, 7820436 Santiago, Chile.
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Guerra Díaz D, Mariño-Ocampo N, Kabanov V, Heyne B, Andrade-Villalobos F, Fierro A, Fuentealba D. Extraordinary Control of Photosensitized Singlet Oxygen Generation by Acyclic Cucurbituril-like Containers. J Phys Chem B 2023; 127:3443-3451. [PMID: 37026709 DOI: 10.1021/acs.jpcb.3c00583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
Abstract
Supramolecular control of singlet oxygen generation is incredibly valuable for several fields with broad applications and thus still challenging. However, macrocyclic inclusion complexes inherently restrict the interaction of photosensitizers with surrounding oxygen in the media. To circumvent this issue, we turned our attention in this work to acyclic cucurbituril-like containers and uncover their properties as supramolecular hosts for photosensitizers with extraordinary control of their photophysics, including singlet oxygen generation. Thermodynamic and photophysical studies were carried out showing that these acyclic containers compare very favorably to benchmark macrocycles such as cucurbiturils and cyclodextrins in terms of their binding affinities and supramolecular control of singlet oxygen generation. Acyclic container with terminal naphthalene walls offers a similar cavity to cucurbit[7]uril and the same carbonyl-lined portals for a tight binding of phenothiazinium dye methylene blue and stabilizing its singlet and triplet excited states. Thus, generation of singlet oxygen for this container is higher than for other macrocycles and even higher than the free photosensitizer. While the acyclic container with smaller terminal benzene walls, stacks over the dye through sulfur-π and π-π interactions deactivating the singlet and triplet excited states, thus showing the lowest generation of singlet oxygen out of all of the studied systems. Due to the great water solubility and biocompatibility of these systems, they possess great potential for novel applications in photocatalysis, synthesis, and biomedical fields, among others.
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Affiliation(s)
- Daniel Guerra Díaz
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Nory Mariño-Ocampo
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Vladimir Kabanov
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Belinda Heyne
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Felipe Andrade-Villalobos
- Departamento de Química Orgánica, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Angélica Fierro
- Departamento de Química Orgánica, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Denis Fuentealba
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
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5
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Mariño-Ocampo N, Rodríguez DF, Guerra Díaz D, Zúñiga-Núñez D, Duarte Y, Fuentealba D, Zacconi FC. Direct Oral FXa Inhibitors Binding to Human Serum Albumin: Spectroscopic, Calorimetric, and Computational Studies. Int J Mol Sci 2023; 24:ijms24054900. [PMID: 36902328 PMCID: PMC10002493 DOI: 10.3390/ijms24054900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 02/26/2023] [Accepted: 03/01/2023] [Indexed: 03/06/2023] Open
Abstract
Direct FXa inhibitors are an important class of bioactive molecules (rivaroxaban, apixaban, edoxaban, and betrixaban) applied for thromboprophylaxis in diverse cardiovascular pathologies. The interaction of active compounds with human serum albumin (HSA), the most abundant protein in blood plasma, is a key research area and provides crucial information about drugs' pharmacokinetics and pharmacodynamic properties. This research focuses on the study of the interactions between HSA and four commercially available direct oral FXa inhibitors, applying methodologies including steady-state and time-resolved fluorescence, isothermal titration calorimetry (ITC), and molecular dynamics. The HSA complexation of FXa inhibitors was found to occur via static quenching, and the complex formation in the ground states affects the fluorescence of HSA, with a moderate binding constant of 104 M-1. However, the ITC studies reported significantly different binding constants (103 M-1) compared with the results obtained through spectrophotometric methods. The suspected binding mode is supported by molecular dynamics simulations, where the predominant interactions were hydrogen bonds and hydrophobic interactions (mainly π-π stacking interactions between the phenyl ring of FXa inhibitors and the indole moiety of Trp214). Finally, the possible implications of the obtained results regarding pathologies such as hypoalbuminemia are briefly discussed.
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Affiliation(s)
- Nory Mariño-Ocampo
- Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Diego F. Rodríguez
- Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Daniel Guerra Díaz
- Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Daniel Zúñiga-Núñez
- Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Yorley Duarte
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago 8370035, Chile
| | - Denis Fuentealba
- Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
- Correspondence: (D.F.); (F.C.Z.)
| | - Flavia C. Zacconi
- Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
- Institute for Biological and Medical Engineering, Schools of Engineering, Medicine and Biological Sciences, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
- Centro de Investigaciones en Nanotecnología y Materiales Avanzados, CIEN-UC, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
- Center for Nanomedicine, Diagnostic & Drug Development (ND3), Universidad de Talca, Talca 3460000, Chile
- Correspondence: (D.F.); (F.C.Z.)
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Schwantes D, Gonçalves Jr. AC, Fuentealba D, Hornos Carneiro MF, Tarley CRT, Prete MC. Removal of chlorpyrifos from water using biosorbents derived from cassava peel, crambe meal, and pinus bark. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.09.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Mariño‐Ocampo N, Dibona‐Villanueva L, Escobar Álvarez E, Guerra‐Díaz D, Zúñiga‐Núñez D, Fuentealba D, Robinson‐Duggon J. Recent Photosensitizer Developments, Delivery Strategies and Combination‐based Approaches for Photodynamic Therapy. Photochem Photobiol 2022; 99:469-497. [PMID: 36434770 DOI: 10.1111/php.13749] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Accepted: 11/23/2022] [Indexed: 11/27/2022]
Abstract
Photodynamic therapy of cancer (PDT) is a therapeutic technique, minimally invasive, which is currently used to treat cancerous lesions and tumors that have been in the spotlight for its potential over the recent decades. Nonetheless, PDT still needs further development to become a first-option treatment for patients. This review compiles recent progress in several aspects of the current research in the constantly growing area of PDT to overcome the main challenges as an attempt to serve as a guide and reference for newcomers into this research area. This review has been prepared to highlight the use of chemical modifications on photosensitizers to improve their solubility, photostability, selectivity and phototoxicity. Additionally, the use of liposomes and cavitands as drug delivery systems to aid in the biodistribution and bioaccumulation of photosensitizers is presented. Also, the combination of PDT with chemotherapy or immunotherapy as an option to boost and improve treatment outcomes is discussed. Finally, the inhibition of antioxidant enzymes as a strategy for a synergistic effect to ameliorate the performance of the photosensitizers in PDT is presented as an alternative for future researchers.
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Affiliation(s)
- Nory Mariño‐Ocampo
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Vicuña Mackenna 4860, Macul Chile Santiago
| | | | - Elizabeth Escobar Álvarez
- Facultad de Ciencias Exactas, Instituto de Química, Universidad de Antioquia Medellín Colombia
- Departamento de Ciencias Biológicas, Escuela de Ciencias Aplicadas e Ingeniería, Universidad EAFIT Medellín Colombia
| | - Daniel Guerra‐Díaz
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Vicuña Mackenna 4860, Macul Chile Santiago
| | - Daniel Zúñiga‐Núñez
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Vicuña Mackenna 4860, Macul Chile Santiago
| | - Denis Fuentealba
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Vicuña Mackenna 4860, Macul Chile Santiago
| | - José Robinson‐Duggon
- Departamento de Bioquímica, Facultad de Ciencias Naturales, Exactas y Tecnología, Universidad de Panamá, Panamá 0824‐00110 Panamá
- Sistema Nacional de Investigación (SNI), Secretaría Nacional de Ciencia, Tecnología e Innovación (SENACYT), Panamá Panamá
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Ávila F, Cruz N, Alarcon-Espósito J, Nina N, Paillan H, Márquez K, Fuentealba D, Burgos-Edwards A, Theoduloz C, Vejar-Vivar C, Schmeda-Hirschmann G. Inhibition of advanced glycation end products and protein oxidation by leaf extracts and phenolics from Chilean bean landraces. J Funct Foods 2022. [DOI: 10.1016/j.jff.2022.105270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
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9
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Jessop IA, Cutipa J, Perez Y, Saldías C, Fuentealba D, Tundidor-Camba A, Terraza CA, Camarada MB, Angel FA. New Benzotriazole and Benzodithiophene-Based Conjugated Terpolymer Bearing a Fluorescein Derivative as Side-Group: In-Ternal Förster Resonance Energy Transfer to Improve Organic Solar Cells. Int J Mol Sci 2022; 23:ijms232112901. [PMID: 36361692 PMCID: PMC9657233 DOI: 10.3390/ijms232112901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 10/19/2022] [Accepted: 10/21/2022] [Indexed: 11/16/2022] Open
Abstract
A new benzodithiophene and benzotriazole-based terpolymer bearing a fluorescein derivative as a side group was synthesized and studied for organic solar cell (OSC) applications. This side group was covalently bounded to the backbone through an n-hexyl chain to induce the intramolecular Förster Resonance Energy Transfer (FRET) process and thus improve the photovoltaic performance of the polymeric material. The polymer exhibited good solubility in common organic chlorinated solvents as well as thermal stability (TDT10% > 360 °C). Photophysical measurements demonstrated the occurrence of the FRET phenomenon between the lateral group and the terpolymer. The terpolymer exhibited an absorption band centered at 501 nm, an optical bandgap of 2.02 eV, and HOMO and LUMO energy levels of −5.30 eV and −3.28 eV, respectively. A preliminary study on terpolymer-based OSC devices showed a low power-conversion efficiency (PCE) but a higher performance than devices based on an analogous polymer without the fluorescein derivative. These results mean that the design presented here is a promising strategy to improve the performance of polymers used in OSCs.
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Affiliation(s)
- Ignacio A. Jessop
- Organic and Polymeric Materials Research Laboratory, Facultad de Ciencias, Universidad de Tarapacá, P.O. Box 7-D, Arica 1000007, Chile
- Correspondence: (I.A.J.); (F.A.A.)
| | - Josefa Cutipa
- Organic and Polymeric Materials Research Laboratory, Facultad de Ciencias, Universidad de Tarapacá, P.O. Box 7-D, Arica 1000007, Chile
| | - Yasmín Perez
- Organic and Polymeric Materials Research Laboratory, Facultad de Ciencias, Universidad de Tarapacá, P.O. Box 7-D, Arica 1000007, Chile
| | - Cesar Saldías
- Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Denis Fuentealba
- Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Alain Tundidor-Camba
- Research Laboratory for Organic Polymers (RLOP), Faculty of Chemistry and of Pharmacy, Pontificia Universidad Católica de Chile, P.O. Box 306, Post 22, Santiago 7820436, Chile
- UC Energy Research Center, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Claudio A. Terraza
- Research Laboratory for Organic Polymers (RLOP), Faculty of Chemistry and of Pharmacy, Pontificia Universidad Católica de Chile, P.O. Box 306, Post 22, Santiago 7820436, Chile
- UC Energy Research Center, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - María B. Camarada
- Departamento de Química Inorgánica, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
- Centro de Nanotecnología y Materiales Avanzados, CIEN-UC, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Felipe A. Angel
- UC Energy Research Center, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
- Departamento de Química Inorgánica, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
- Centro de Nanotecnología y Materiales Avanzados, CIEN-UC, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
- Correspondence: (I.A.J.); (F.A.A.)
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Dibona-Villanueva L, Fuentealba D. Protoporphyrin IX-Chitosan Oligosaccharide Conjugate with Potent Antifungal Photodynamic Activity. J Agric Food Chem 2022; 70:9276-9282. [PMID: 35866700 DOI: 10.1021/acs.jafc.2c01644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
A new chemical conjugate between protoporphyrin IX (PPIX) and chitosan oligosaccharides (CH) was prepared and evaluated in vitro as an antifungal agent against Penicillium digitatum. Chemical characterization and photophysical/photochemical studies were conducted. The antifungal effect of the CH-PPIX conjugate was compared to its components (PPIX and CH) and a physical mixture of both, under dark and illuminated conditions. The CH-PPIX conjugate was photostable and inhibited fungal growth with 100% efficiency at a dose of 0.005% w/v under visible light irradiation, while no antifungal activity was observed in the dark. Under the same conditions, CH and PPIX did not display any fungicidal activity, demonstrating the improved properties of the conjugate. Insights into the mechanism of fungal inactivation revealed an efficient spore uptake and photoinduced membrane damage through singlet oxygen generation. This new bioconjugate, which is based on natural components, represents a promising agent for fungicidal formulations based on antimicrobial photodynamic therapy.
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Affiliation(s)
- Luciano Dibona-Villanueva
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Macul, Santiago 7820436, Chile
| | - Denis Fuentealba
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Macul, Santiago 7820436, Chile
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11
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Andrade-Villalobos F, Zúñiga-Núñez D, Fuentealba D, Fierro A. Binding of toluidine blue-myristic acid derivative to cucurbit[7]uril and human serum albumin: computational and biophysical insights towards a biosupramolecular assembly. Phys Chem Chem Phys 2022; 24:3222-3230. [PMID: 35044390 DOI: 10.1039/d1cp04307b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A new toluidine blue-myristic acid photosensitizer derivate (TBOMyr) was investigated as a design molecule to bind simultaneously to cucurbit[7]uril (CB[7]) and human serum albumin (HSA) with the aim of constructing a biosupramolecular assembly. Molecular docking and dynamics calculations revealed the main supramolecular and bio-molecular interactions of TBOMyr with the macrocycle or the protein, respectively. The addition of the negatively charged myristic acid-like tail resulted in a unique conformation of the CB[7] complex where the phenothiazine core was included in the cavity of CB[7], leaving the fatty acid portion free to interact with the protein. A favorable ternary interaction between TBOMyr, CB[7] and HSA was suggested by the calculations, and an experimental binding affinity in the order of 105 M-1 was determined for the TBOMyr@CB[7] complex with HSA. The new TBOMyr derivative could find applications in photodynamic therapy benefiting from the biosupramolecular interactions as a transport system.
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Affiliation(s)
- Felipe Andrade-Villalobos
- Departamento de Química Orgánica, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile. .,Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile.
| | - Daniel Zúñiga-Núñez
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile.
| | - Denis Fuentealba
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile.
| | - Angelica Fierro
- Departamento de Química Orgánica, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile.
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12
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Solis-Egaña F, Lavín-Urqueta N, Guerra Díaz D, Mariño-Ocampo N, Faúndez MA, Fuentealba D. Supramolecular co-encapsulation of a photosensitizer and chemotherapeutic drug in cucurbit[8]uril for potential chemophototherapy. Photochem Photobiol Sci 2022; 21:349-359. [PMID: 35088367 DOI: 10.1007/s43630-022-00174-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Accepted: 01/14/2022] [Indexed: 11/25/2022]
Abstract
Supramolecular strategies as well as combinatorial approaches have been proposed to improve cancer therapeutics. In this work, we investigated the encapsulation of the photosensitizer acridine orange (AO) and the chemotherapeutic drug oxaliplatin (OxPt) in cucurbit[8]uril (CB[8]), and tested their effect both separate and combined on tumoral cells cultivated in vitro. Binding constants and enthalpies of reaction for the AO@CB[8], (AO)2@CB[8] and OxPt@CB[8] complexes were determined by isothermal titration calorimetry. In the case of AO, a negative cooperativity for the binding of the second AO molecule was found, in agreement with previous fluorescence titration data. We show herein that the AO@CB[8] complex was effectively incorporated within the cells and showed important phototoxicity, while the OxPt@CB[8] complex was cytotoxic only at long incubation times (24 h). Pre-treatment of the cells with the OxPt@CB[8] complex for 24 h inhibited any photodynamic action by the later treatment with the AO@CB[8] complex. However, when both complexes were co-incubated for 90 min, the combined cytotoxicity/phototoxicity was superior to any of the treatments individually. A cooperative effect was identified that added up to an extra 30% cytotoxicity/phototoxicity. The results point to an interesting system where a photosensitizer and chemotherapeutic drug are co-encapsulated in a macrocycle to develop chemophototherapy applications.
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Affiliation(s)
- Fresia Solis-Egaña
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Nicole Lavín-Urqueta
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Daniel Guerra Díaz
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Nory Mariño-Ocampo
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Mario A Faúndez
- Escuela de Farmacia, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Denis Fuentealba
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile.
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Almendras S, Zárate AM, Dinamarca-Villarroel L, Guerra D, Fuentealba D, Eltit JM, Aliaga ME, Fierro A, Pérez EG. Host–guest complexation of APP + with cucurbit[7]uril. Theoretical and experimental studies on the supramolecular inhibition of its cytotoxicity on SERT. NEW J CHEM 2022. [DOI: 10.1039/d2nj01963a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The supramolecular binding behavior of APP+ and CB[7] in aqueous solution was studied by different techniques. APP+ showed cytotoxicity towards HEK293 cells expressing hSERT. This cytotoxicity was inhibited by the treatment of the cells with CB[7].
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Affiliation(s)
- Sebastián Almendras
- Department of Organic Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Ana María Zárate
- Department of Organic Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Luis Dinamarca-Villarroel
- Department of Organic Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Daniel Guerra
- Department of Physical Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Denis Fuentealba
- Department of Physical Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Jose M. Eltit
- Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, Richmond, Virginia 23298, USA
| | - Margarita E. Aliaga
- Department of Physical Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Angélica Fierro
- Department of Organic Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Edwin G. Pérez
- Department of Organic Chemistry, School of Chemistry, Faculty of Chemistry and Pharmacy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
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Robinson-Duggon J, McTiernan CD, Muñoz M, Guerra D, Escobar Álvarez E, Andrade-Villalobos F, Fierro A, Edwards AM, Alarcon EI, Fuentealba D. Biosupramolecular complexes of amphiphilic photosensitizers with human serum albumin and cucurbit[7]uril as carriers for photodynamic therapy. J Photochem Photobiol B 2021; 223:112284. [PMID: 34450362 DOI: 10.1016/j.jphotobiol.2021.112284] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 07/21/2021] [Accepted: 08/09/2021] [Indexed: 01/17/2023]
Abstract
In the present work, we evaluated the supramolecular interactions between three photosensitizers, namely toluidine blue O (TBO, positively charged) and two fatty acid conjugates of 6 and 14 carbon atoms chain lengths (TBOC6 and TBOC14), with human serum albumin (HSA) and the macrocycle cucurbit[7]uril (CB[7]), alone or in combination within a biosupramolecular system as potential carriers of photosensitizers for Photodynamic therapy (PDT). Binding studies were carried out using photophysical and calorimetric techniques and accompanied with molecular docking simulations. Amphiphilic photosensitizers, particularly TBOC14, showed stronger binding to HSA and (CB[7]). Comparing the different delivery systems, (CB[7]) had a marginal effect on cell uptake and phototoxicity in HeLa cells, while HSA showed enhanced cell uptake with phototoxicities that depended on the photosensitizer. Despite low cell uptake, the combination of both (CB[7]) and HSA was the most phototoxic, which illustrates the potential of combining these systems for PDT applications.
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Affiliation(s)
- José Robinson-Duggon
- Laboratorio de Química Biosupramolecular, Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile; Departamento de Bioquímica, Facultad de Ciencias Naturales, Exactas y Tecnología, Universidad de Panamá, Panamá 0824, Panamá.
| | - Christopher D McTiernan
- BEaTS Research Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, Ottawa, ON K1Y4W7, Canada
| | - Marcelo Muñoz
- BEaTS Research Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, Ottawa, ON K1Y4W7, Canada
| | - Daniel Guerra
- Laboratorio de Química Biosupramolecular, Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Elizabeth Escobar Álvarez
- Laboratorio de Química Biosupramolecular, Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Felipe Andrade-Villalobos
- Laboratorio de Química Biosupramolecular, Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile; Departamento de Química Orgánica, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Angélica Fierro
- Departamento de Química Orgánica, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Ana María Edwards
- Laboratorio de Química Biosupramolecular, Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Emilio I Alarcon
- BEaTS Research Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, Ottawa, ON K1Y4W7, Canada; Department of Biochemistry, Microbiology, and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada
| | - Denis Fuentealba
- Laboratorio de Química Biosupramolecular, Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile.
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15
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Lorente C, Thomas AH, Fuentealba D. Special Issue Devoted to the XIV ELAFOT Conference (XIV Encuentro Latinoamericano de Fotoquímica y Fotobiología). Photochem Photobiol 2021; 97:4. [PMID: 33491198 DOI: 10.1111/php.13357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 11/12/2020] [Accepted: 11/12/2020] [Indexed: 11/29/2022]
Affiliation(s)
- Carolina Lorente
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata (UNLP), CCT La Plata-CONICET, La Plata, Argentina
| | - Andrés H Thomas
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata (UNLP), CCT La Plata-CONICET, La Plata, Argentina
| | - Denis Fuentealba
- Laboratorio de Química Biosupramolecular, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago de Chile, Chile
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16
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Dibona-Villanueva L, Fuentealba D. Novel Chitosan-Riboflavin Conjugate with Visible Light-Enhanced Antifungal Properties against Penicillium digitatum. J Agric Food Chem 2021; 69:945-954. [PMID: 33438400 DOI: 10.1021/acs.jafc.0c08154] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A novel chemical conjugate between chitosan (CH) and riboflavin (RF) has been synthesized and characterized via Fourier transform infrared, NMR, and other spectroscopic methods. Photophysical and photochemical properties such as absorption spectra, fluorescence emission, fluorescence anisotropy, and singlet oxygen generation were characterized as well. This new biopolymer-based conjugate was designed to have an antifungal effect enhanced through antimicrobial photodynamic therapy. The antifungal effect of this conjugate (CH-RF) was compared with CH and RF against Penicillium digitatum in vitro. The conjugate showed the highest fungal growth inhibition of all systems tested at a dose of 0.5% w/v. This new biopolymer-based compound could be a promising alternative to fungicides used in citrus fruits postharvest.
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Affiliation(s)
- Luciano Dibona-Villanueva
- Laboratorio de Química Biosupramolecular, Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Denis Fuentealba
- Laboratorio de Química Biosupramolecular, Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
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17
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Herrera C, Pinto‐Neira J, Fuentealba D, Sepúlveda C, Rosenkranz A, García‐Fierro JL, González M, Escalona N. Effect of Ni Metal Content on Emulsifying Properties of Ni/CNTox Catalysts for Catalytic Conversion of Furfural in Pickering Emulsions. ChemCatChem 2020. [DOI: 10.1002/cctc.202001045] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- C. Herrera
- Departamento de Química física Facultad de Química y Farmacia Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860 Macul, Santiago Chile
- ANID – Millennium Science Initiative Program-Millennium Nuclei on Catalytic Process towards Sustainable Chemistry (CSC), Av. Vicuña Mackenna 4860 Macul, Santiago Chile
| | - J. Pinto‐Neira
- Departamento de Química física Facultad de Química y Farmacia Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860 Macul, Santiago Chile
- ANID – Millennium Science Initiative Program-Millennium Nuclei on Catalytic Process towards Sustainable Chemistry (CSC), Av. Vicuña Mackenna 4860 Macul, Santiago Chile
| | - D. Fuentealba
- Departamento de Química física Facultad de Química y Farmacia Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860 Macul, Santiago Chile
| | - C. Sepúlveda
- ANID – Millennium Science Initiative Program-Millennium Nuclei on Catalytic Process towards Sustainable Chemistry (CSC), Av. Vicuña Mackenna 4860 Macul, Santiago Chile
- Facultad de Ciencias Químicas Universidad de Concepción Chile
- Casilla 160 C Universidad de Concepción Concepción Chile
| | - A. Rosenkranz
- Departamento de Ingeniería Química Biotecnología y Materiales Facultad de Ciencias Físicas y Matemáticas Universidad de Chile Av. Beaucheff 851 Santiago Chile
| | - J. L. García‐Fierro
- Instituto de Catálisis y Petroleoquímica CSIC C/Marie Curie 2, Cantoblanco Madrid Spain
| | - M. González
- Departamento de Ingeniería y gestión de la construcción Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860 Macul, Santiago Chile
| | - N. Escalona
- Departamento de Química física Facultad de Química y Farmacia Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860 Macul, Santiago Chile
- ANID – Millennium Science Initiative Program-Millennium Nuclei on Catalytic Process towards Sustainable Chemistry (CSC), Av. Vicuña Mackenna 4860 Macul, Santiago Chile
- Departamento de Ingeniería Química y Bioprocesos Escuela de Ingeniería Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860 Macul, Santiago Chile
- Unidad de Desarrollo Tecnológico Universidad de Concepción Avenida Cordillera N° 3624, Parque Industrial Coronel Coronel, Concepciòn Chile
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Herrera C, Fuentealba D, Ghampson I, Sepulveda C, García-Fierro J, Canales RI, Escalona N. Selective conversion of biomass-derived furfural to cyclopentanone over carbon nanotube-supported Ni catalyst in Pickering emulsions. CATAL COMMUN 2020. [DOI: 10.1016/j.catcom.2020.106092] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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Robinson-Duggon J, Pizarro N, Gunther G, Zúñiga-Núñez D, Edwards AM, Greer A, Fuentealba D. Fatty Acid Conjugates of Toluidine Blue O as Amphiphilic Photosensitizers: Synthesis, Solubility, Photophysics and Photochemical Properties †. Photochem Photobiol 2020; 97:71-79. [PMID: 32619275 DOI: 10.1111/php.13304] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 06/07/2020] [Accepted: 06/25/2020] [Indexed: 02/06/2023]
Abstract
Toluidine blue O (TBO) is a water-soluble photosensitizer that has been used in photodynamic antimicrobial and anticancer treatments, but suffers from limited solubility in hydrophobic media. In an effort to incrementally increase TBO's hydrophobicity, we describe the synthesis of hexanoic (TBOC6) and myristic (TBOC14) fatty acid derivatives of TBO formed in low to moderate percent yields by condensation with the free amine site. Covalently linking 6 and 14 carbon chains led to modifications of not only TBO's solubility, but also its photophysical and photochemical properties. TBOC6 and TBOC14 derivatives were more soluble in organic solvents and showed hypsochromic shifts in their absorption and emission bands. The solubility in phosphate buffer solution was low for both TBOC6 and TBOC14, but unexpectedly slightly greater in the latter. Both TBOC6 and TBOC14 showed decreased triplet excited-state lifetimes and singlet oxygen quantum yields in acetonitrile, which was attributed to heightened aggregation of these conjugates particularly at high concentrations due to the hydrophobic "tails." While in diluted aqueous buffer solution, indirect measurements showed similar efficiency in singlet oxygen generation for TBOC14 compared to TBO. This work demonstrates a facile synthesis of fatty acid TBO derivatives leading to amphiphilic compounds with a delocalized cationic "head" group and hydrophobic "tails" for potential to accumulate into biological membranes or membrane/aqueous interfaces in PDT applications.
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Affiliation(s)
- José Robinson-Duggon
- Laboratorio de Química Biosupramolecular, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Macul, Santiago, Chile.,Departamento de Bioquímica, Facultad de Ciencias Naturales, Exactas y Tecnología, Universidad de Panamá, Panamá City, Panamá
| | - Nancy Pizarro
- Departamento de Ciencias Químicas, Facultad de Ciencias Exactas, Universidad Andrés Bello, Santiago, Chile
| | - Germán Gunther
- Facultad de Ciencias Químicas y Farmacéuticas, Departamento de Química Orgánica y Fisicoquímica, Universidad de Chile, Santiago, Chile
| | - Daniel Zúñiga-Núñez
- Laboratorio de Química Biosupramolecular, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Macul, Santiago, Chile
| | - Ana María Edwards
- Laboratorio de Química Biosupramolecular, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Macul, Santiago, Chile
| | - Alexander Greer
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, NY, USA.,The Graduate Center of the City University of New York, New York, NY, USA
| | - Denis Fuentealba
- Laboratorio de Química Biosupramolecular, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Macul, Santiago, Chile
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Robinson-Duggon J, Mariño-Ocampo N, Barrias P, Zúñiga-Núñez D, Günther G, Edwards AM, Greer A, Fuentealba D. Mechanism of Visible-Light Photooxidative Demethylation of Toluidine Blue O. J Phys Chem A 2019; 123:4863-4872. [DOI: 10.1021/acs.jpca.9b03588] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- José Robinson-Duggon
- Laboratorio de Química Biosupramolecular, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
- Departamento de Bioquímica, Facultad de Ciencias Naturales, Exactas y Tecnología, Universidad de Panamá, Panamá 0824, Panamá
| | - Nory Mariño-Ocampo
- Laboratorio de Química Biosupramolecular, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Pablo Barrias
- Laboratorio de Cinética y Fotoquímica, Facultad de Química y Biología, Universidad de Santiago de Chile, Alameda 3363, Estación Central, Santiago, Chile
| | - Daniel Zúñiga-Núñez
- Laboratorio de Cinética y Fotoquímica, Facultad de Química y Biología, Universidad de Santiago de Chile, Alameda 3363, Estación Central, Santiago, Chile
| | - Germán Günther
- Facultad de Ciencias Químicas y Farmacéuticas, Departamento de Química Orgánica y Fisicoquímica, Universidad de Chile, Casilla 233, Santiago, Chile
| | - Ana María Edwards
- Laboratorio de Química Biosupramolecular, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Alexander Greer
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Denis Fuentealba
- Laboratorio de Química Biosupramolecular, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
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Villarroel-Lecourt G, Carrasco-Carvajal J, Andrade-Villalobos F, Solís-Egaña F, Merino-San Martín I, Robinson-Duggon J, Fuentealba D. Encapsulation of Chemotherapeutic Drug Melphalan in Cucurbit[7]uril: Effects on Its Alkylating Activity, Hydrolysis, and Cytotoxicity. ACS Omega 2018; 3:8337-8343. [PMID: 30087942 PMCID: PMC6072240 DOI: 10.1021/acsomega.8b01335] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 07/18/2018] [Indexed: 05/31/2023]
Abstract
The formation of inclusion complexes between drugs and macrocycles has proven to be an effective strategy to increase solubilization and stabilization of the drug, while in several cases improving their biological activity. In this context, we explored the formation of an inclusion complex between chemotherapeutic drug Melphalan (Mel) and cucurbit[7]uril (CB[7]), and studied its effect on Mel alkylating activity, hydrolysis, and cytotoxicity. The formation of the inclusion complex (Mel@CB[7]) was proven by absorption and fluorescence spectroscopy, NMR, docking studies, and molecular dynamics simulations. The binding constant for Mel and CB[7] was fairly high at pH 1 ((1.7 ± 0.7) × 106 M-1), whereas no binding was observed at neutral pH. The Mel@CB[7] complex showed a slightly decreased alkylating activity, whereas the cytotoxicity on the HL-60 cell line was maintained. The formation of the complex did not protect Mel from hydrolysis, and this result is discussed based on the simulated structure for the complex.
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22
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Cáceres J, Robinson-Duggon J, Tapia A, Paiva C, Gómez M, Bohne C, Fuentealba D. Photochemical behavior of biosupramolecular assemblies of photosensitizers, cucurbit[n]urils and albumins. Phys Chem Chem Phys 2018; 19:2574-2582. [PMID: 28059428 DOI: 10.1039/c6cp07749h] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Biosupramolecular assemblies combining cucurbit[n]urils (CB[n]s) and proteins for the targeted delivery of drugs have the potential to improve the photoactivity of photosensitizers used in the photodynamic therapy of cancer. Understanding the complexity of these systems and how it affects the properties of photosensitizers is the focus of this work. We used acridine orange (AO+) as a model photosensitizer and compared it with methylene blue (MB+) and a cationic porphyrin (TMPyP4+). Encapsulation of the photosensitizers into CB[n]s (n = 7, 8) modified their photoactivity. In particular, for AO+, the photo-oxidation of HSA was enhanced in the presence of CB[7]; meanwhile it was decreased when included into CB[8]. Accordingly, peroxide generation and protein fragmentation were also increased when AO+ was encapsulated into CB[7]. The triplet excited state lifetimes of all the photosensitizers were lengthened by their encapsulation into CB[n]s, while the singlet oxygen quantum yield was enhanced only for AO+ and TMPyP4+, but it decreased for MB+. The results obtained in this work prompt the necessity of further investigating these kinds of hybrid assemblies as drug delivery systems because of their possible applications in biomedicine.
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Affiliation(s)
- Javiera Cáceres
- Laboratorio de Estructuras Biosupramoleculares, Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - José Robinson-Duggon
- Laboratorio de Estructuras Biosupramoleculares, Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Anita Tapia
- Laboratorio de Estructuras Biosupramoleculares, Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Constanza Paiva
- Laboratorio de Estructuras Biosupramoleculares, Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Matías Gómez
- Laboratorio de Estructuras Biosupramoleculares, Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Cornelia Bohne
- Department of Chemistry, University of Victoria, P.O. Box 1700 STN CSC, Victoria, BC V8W 2Y2, Canada
| | - Denis Fuentealba
- Laboratorio de Estructuras Biosupramoleculares, Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile, Santiago, Chile.
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Robinson-Duggon J, Pérez-Mora F, Dibona-Villanueva L, Fuentealba D. Potential Applications of Cucurbit[n
]urils Inclusion Complexes in Photodynamic Therapy. Isr J Chem 2017. [DOI: 10.1002/ijch.201700093] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- José Robinson-Duggon
- Laboratorio de Estructuras Biosupramoleculares, Facultad de Química; Pontificia Universidad Católica de Chile; Vicuña Mackenna 4860 Macul Santiago
| | - Francisco Pérez-Mora
- Laboratorio de Estructuras Biosupramoleculares, Facultad de Química; Pontificia Universidad Católica de Chile; Vicuña Mackenna 4860 Macul Santiago
| | - Luciano Dibona-Villanueva
- Laboratorio de Estructuras Biosupramoleculares, Facultad de Química; Pontificia Universidad Católica de Chile; Vicuña Mackenna 4860 Macul Santiago
| | - Denis Fuentealba
- Laboratorio de Estructuras Biosupramoleculares, Facultad de Química; Pontificia Universidad Católica de Chile; Vicuña Mackenna 4860 Macul Santiago
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Espinosa-Bustos C, Cortés-Arriagada D, Soto-Arriaza MA, Robinson-Duggon J, Pizarro N, Cabrera AR, Fuentealba D, Salas CO. Fluorescence properties of aurone derivatives: an experimental and theoretical study with some preliminary biological applications. Photochem Photobiol Sci 2017. [DOI: 10.1039/c7pp00078b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper, we explored the fluorescence properties of eight aurone derivatives bearing methoxy groups and bromine atoms as substituents in the benzene rings.
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Affiliation(s)
- Christian Espinosa-Bustos
- Departamento de Química Orgánica
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago 6094411
- Chile
| | - Diego Cortés-Arriagada
- Programa Institucional de Fomento a la Investigación
- Desarrollo e Innovación. Universidad Tecnológica Metropolitana
- Santiago
- Chile
| | - Marco A. Soto-Arriaza
- Departamento de Química Física
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago 6094411
- Chile
| | - José Robinson-Duggon
- Departamento de Química Física
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago 6094411
- Chile
| | - Nancy Pizarro
- Departamento de Ciencias Químicas
- Facultad de Ciencias Exactas
- Universidad Andrés Bello
- Viña del Mar 2531015
- Chile
| | - Alan R. Cabrera
- Departamento de Química Orgánica
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago 6094411
- Chile
| | - Denis Fuentealba
- Departamento de Química Física
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago 6094411
- Chile
| | - Cristian O. Salas
- Departamento de Química Orgánica
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago 6094411
- Chile
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25
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Fukuhara G, Imai M, Fuentealba D, Ishida Y, Kurohara H, Yang C, Mori T, Uyama H, Bohne C, Inoue Y. Electrostatically promoted dynamic hybridization of glucans with cationic polythiophene. Org Biomol Chem 2016; 14:9741-9750. [DOI: 10.1039/c6ob01353h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A hetero-triplex composed of a glucan and a cationic polythiophene was dynamic and disassembled into a hetero-duplex in basic solutions.
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Affiliation(s)
- Gaku Fukuhara
- Department of Applied Chemistry
- Osaka University
- Suita 565-0871
- Japan
| | - Mami Imai
- Department of Applied Chemistry
- Osaka University
- Suita 565-0871
- Japan
| | - Denis Fuentealba
- Department of Chemistry
- University of Victoria
- Victoria
- Canada
- Laboratorio de Estructuras Biosupramoleculares
| | - Yuki Ishida
- Department of Applied Chemistry
- Osaka University
- Suita 565-0871
- Japan
| | - Hiroki Kurohara
- Department of Applied Chemistry
- Osaka University
- Suita 565-0871
- Japan
| | - Cheng Yang
- Department of Applied Chemistry
- Osaka University
- Suita 565-0871
- Japan
- Key Lab of Green Chemistry and Technology
| | - Tadashi Mori
- Department of Applied Chemistry
- Osaka University
- Suita 565-0871
- Japan
| | - Hiroshi Uyama
- Department of Applied Chemistry
- Osaka University
- Suita 565-0871
- Japan
| | - Cornelia Bohne
- Department of Chemistry
- University of Victoria
- Victoria
- Canada
| | - Yoshihisa Inoue
- Department of Applied Chemistry
- Osaka University
- Suita 565-0871
- Japan
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26
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Scholtbach K, Venegas Í, Bohne C, Fuentealba D. Time-resolved fluorescence anisotropy as a tool to study guest–cucurbit[n]uril–protein ternary supramolecular interactions. Photochem Photobiol Sci 2015; 14:842-52. [DOI: 10.1039/c4pp00479e] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A combined time-resolved fluorescence and anisotropy analysis was used to study guest–cucurbit[n]uril–protein ternary supramolecular interactions in a model system.
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Affiliation(s)
- Karina Scholtbach
- Laboratorio de Química Biológica
- Departamento de Química Física
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago
| | - Ítalo Venegas
- Laboratorio de Química Biológica
- Departamento de Química Física
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago
| | - Cornelia Bohne
- Department of Chemistry
- University of Victoria
- Victoria
- Canada V8W 3V6
| | - Denis Fuentealba
- Laboratorio de Química Biológica
- Departamento de Química Física
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago
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27
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Fuentealba D, Venegas C, Morales M, Waissbluth O. Comparing Photo-Fenton Degradation of Malachite Green Using FeIIand FeIIISalts Under UVA Light Irradiation. J BRAZIL CHEM SOC 2015. [DOI: 10.5935/0103-5053.20150258] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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28
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Aliaga ME, García-Río L, Pessêgo M, Montecinos R, Fuentealba D, Uribe I, Martín-Pastor M, García-Beltrán O. Host–guest interaction of coumarin-derivative dyes and cucurbit[7]uril: leading to the formation of supramolecular ternary complexes with mercuric ions. NEW J CHEM 2015. [DOI: 10.1039/c5nj00162e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The interaction between the studied coumarin derivatives-cucurbit[7]uril complexes and mercuric ions displays a positive cooperative effect relative to the dyes alone.
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Affiliation(s)
| | - Luis García-Río
- Departamento de Química Física
- Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS)
- Universidad de Santiago
- 15782 Santiago
- Spain
| | - Márcia Pessêgo
- Departamento de Química Física
- Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS)
- Universidad de Santiago
- 15782 Santiago
- Spain
| | - Rodrigo Montecinos
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Casilla 306
- Chile
| | - Denis Fuentealba
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Casilla 306
- Chile
| | - Iván Uribe
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Casilla 306
- Chile
| | - Manuel Martín-Pastor
- Unidade de Resonancia Magnética
- RIAIDT
- Edif. CACTUS
- Universidad de Santiago
- 15782 Santiago
| | - Olimpo García-Beltrán
- Facultad de Ciencias Naturales y Matemáticas
- Universidad de Ibagué
- Carrera 22 Calle 67
- Colombia
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Abstract
Methylene blue is protected from Fenton oxidation when encapsulated into cucurbit[7]uril or cucurbit[8]uril under dark or UVA irradiation. However, visible light enhances the degradation only when cucurbit[7]uril is present.
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Affiliation(s)
- Tomás Fuenzalida
- Laboratorio de Química Biológica
- Departamento de Química Física
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago
| | - Denis Fuentealba
- Laboratorio de Química Biológica
- Departamento de Química Física
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago
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30
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Fuentealba D, López JJ, Palominos M, Salas CO, Soto-Arriaza MA. Gramicidin conformational changes during riboflavin photosensitized oxidation in solution and the effect of N-methylation of tryptophan residues. Photochem Photobiol Sci 2015; 14:748-56. [DOI: 10.1039/c4pp00414k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
During riboflavin mediated photo-oxidation, gramicidin changes from intertwined to monomeric conformation (disaggregation), while the methylated derivative is not photo-oxidized.
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Affiliation(s)
- Denis Fuentealba
- Laboratorio de Química Biológica
- Departamento de Química Física
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago
| | - Jhon J. López
- Departamento de Química Orgánica
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago
- Chile
| | - Marco Palominos
- Laboratorio de Química Biológica
- Departamento de Química Física
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago
| | - Cristian O. Salas
- Departamento de Química Orgánica
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago
- Chile
| | - Marco A. Soto-Arriaza
- Laboratorio de Química Biológica
- Departamento de Química Física
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago
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31
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Fuentealba D, Kato H, Nishijima M, Fukuhara G, Mori T, Inoue Y, Bohne C. Explaining the Highly Enantiomeric Photocyclodimerization of 2-Anthracenecarboxylate Bound to Human Serum Albumin Using Time-Resolved Anisotropy Studies. J Am Chem Soc 2012; 135:203-9. [DOI: 10.1021/ja3081555] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Denis Fuentealba
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British
Columbia, Canada V8W 3 V6
| | | | | | | | | | | | - Cornelia Bohne
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British
Columbia, Canada V8W 3 V6
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Abstract
Bile acids are amphiphilic endogenous steroids that act as anionic surfactants in the digestive tract and aggregate in aqueous solutions. Nonionic surfactants were synthesized by grafting poly(ethylene glycol) chains of various lengths (pegylation) to three bile acids (lithocholic, deoxycholic, and cholic acid) using anionic polymerization. The aggregation properties of the derivatives were studied with viscosity measurements and light scattering as well as with steady-state and time-resolved fluorescence techniques, and the aggregates were visualized by transmission electron microscopy to elucidate the effect of pegylation on the aggregation process. The fluorescence results showed a good correlation with the capacity of the bile acid derivatives to solubilize a hydrophobic drug molecule. The solubilization of ibuprofen depends on the length and the number of grafted PEG chains, and the solubilization efficiency increases with fewer PEG chains on the bile acid. The results indicate their potential for use in the design of new bile acid-based drug-delivery systems.
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Affiliation(s)
- Frantz Le Dévédec
- Department of Chemistry, Université de Montréal, C.P. 6128 succursale Centre-Ville, Montréal, QC, H3C 3J7 Canada
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33
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Bergen A, Bohne C, Fuentealba D, Ihmels H, Bats JW, Deiseroth HJ, Neumann E. Studies of the solvatochromic emission properties of N-aroylurea derivatives II: influence of hydrogen-bonding interactions. Photochem Photobiol Sci 2012; 11:1914-28. [PMID: 22945663 DOI: 10.1039/c2pp25167a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The solvatochromic emission properties of five naphthoylurea derivatives with different substitution patterns at the naphthoylurea functionality were investigated, with a particular focus on the influence of inter- and intramolecular H-bonding interactions. The bathochromic shifts of the emission maxima correlate well with the acceptor number or Catalán's acidity of the solvent (Δλ = 47-86 nm), indicating an excited species with a pronounced negative charge that is stabilized by H-bond donating (HBD) solvents. In media with restricted free volume the formation of the charged species is not favored, because the required conformational change to establish an intramolecular charge transfer (ICT) between the fluorophore and the acylurea substituent is hindered, and the emission mainly originates from the locally excited state. This relationship between the alignment of the naphthoyl carbonyl functionality relative to the naphthyl ring and the spectroscopic shift was confirmed by the comparison of the ground state conformation and the emission spectra of the naphthoylurea derivatives in the solid state. Time-resolved experiments revealed different excited entities, whose lifetimes are significantly influenced by the HBD properties and the temperature of the environment. With few exceptions the naphthoylurea derivatives exhibit only two emissive species in the nanosecond range. All experimental data point to conformational relaxation and solvent reorganization leading to the cis and trans isomers of one preferential conformer with respect to the acylurea unit. The structure of the preferred conformation is mainly determined by the possible inter- or intramolecular H-bonds and is therefore also strongly influenced by the HBD and H-bond accepting (HBA) properties of the polar solvents. As the NH groups of the acylurea functionality contribute mainly to the entire inter- and intramolecular H-bond arrangement the variation of the substitution pattern of the urea unit, specifically the presence and position of the NH groups, leads to derivatives with significantly different steady-state and time-resolved emission properties.
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Affiliation(s)
- Anna Bergen
- Department of Chemistry and Biology, University of Siegen, Siegen, Germany
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34
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Bergen A, Bohne C, Fuentealba D, Ihmels H, Pace TCS, Waidelich M, Yihwa C, Willem Bats J. Studies of the solvatochromic emission properties of N-aroylurea derivatives I: Influence of the substitution pattern. Photochem Photobiol Sci 2012; 11:752-67. [DOI: 10.1039/c2pp05386a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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35
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Tang H, Fuentealba D, Ko YH, Selvapalam N, Kim K, Bohne C. Guest Binding Dynamics with Cucurbit[7]uril in the Presence of Cations. J Am Chem Soc 2011; 133:20623-33. [DOI: 10.1021/ja209266x] [Citation(s) in RCA: 158] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Hao Tang
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC, Canada V8W 3V6
| | - Denis Fuentealba
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC, Canada V8W 3V6
| | - Young Ho Ko
- Center for Smart Supramolecules, Department of Chemistry and Division of Advanced Materials Science, Pohang University of Science and Technology, San 31 Hyojadong, Pohang 790-784, Republic of Korea
| | - Narayanan Selvapalam
- Center for Smart Supramolecules, Department of Chemistry and Division of Advanced Materials Science, Pohang University of Science and Technology, San 31 Hyojadong, Pohang 790-784, Republic of Korea
| | - Kimoon Kim
- Center for Smart Supramolecules, Department of Chemistry and Division of Advanced Materials Science, Pohang University of Science and Technology, San 31 Hyojadong, Pohang 790-784, Republic of Korea
| | - Cornelia Bohne
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC, Canada V8W 3V6
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Fuentealba D, Thurber K, Bovero E, Pace TCS, Bohne C. Effect of sodium chloride on the binding of polyaromatic hydrocarbon guests with sodium cholate aggregates. Photochem Photobiol Sci 2011; 10:1420-30. [DOI: 10.1039/c1pp05058c] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Fuentealba D, Friguet B, Silva E. Advanced Glycation Endproducts Induce Photocrosslinking and Oxidation of Bovine Lens Proteins Through Type-I Mechanism. Photochem Photobiol 2009; 85:185-94. [DOI: 10.1111/j.1751-1097.2008.00415.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ávila F, Matus A, Fuentealba D, Lissi E, Friguet B, Silva E. Autosensitized oxidation of glycated bovine lens proteins irradiated with UVA-visible light at low oxygen concentration. Photochem Photobiol Sci 2008; 7:718-24. [DOI: 10.1039/b719167g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Fuentealba D, Galvez M, Alarcón E, Lissi E, Silva E. Photosensitizing Activity of Advanced Glycation Endproducts on Tryptophan, Glucose 6-phosphate Dehydrogenase, Human Serum Albumin and Ascorbic Acid Evaluated at Low Oxygen Pressure†. Photochem Photobiol 2007; 83:563-9. [PMID: 17007563 DOI: 10.1562/2006-08-01-ra-990] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A comparative study of the photosensitizing activity of advanced glycation endproducts (AGEs) prepared by incubating glucose (Glc), threose (Threo) and ascorbate (AH-) in the presence of lysine (Lys) was performed. Photochemical activity was evaluated under low oxygen pressure with the aim to simulate the conditions of the eye lens. AGE-sensitized tryptophan and AH- photodecomposition and glucose 6-phosphate dehydrogenase inactivation were studied. In all systems, glucose-derived AGEs showed the highest photosensitizing efficiency, followed by ascorbate and threose. The presence of different sensitizers in glycation products mixtures was investigated. For this purpose, Trp decomposition quantum yields were determined at 344 and 367 nm. The values obtained at 344 nm are between three and six times higher than those observed at 367 nm, confirming the presence of at least two compounds with different photosensitizing activities in the mixtures. The chemiluminescence associated with the AGE-mediated oxidation of free Trp and Trp residues in human serum albumin was also studied, and a good correlation between the emission of light and the extent of Trp decomposition was found. In conclusion, it is demonstrated that glucose derived AGEs, which can be formed in vivo in the eye lens of diabetic patients and are accumulated in elderly lenses, have a higher photosensitizing efficiency, at low oxygen pressure, than those arising from ascorbate and threose. This high efficiency is especially significant when proteins are employed as photochemical targets, indicating that protein-sensitizer interaction and the local environment around the sensitizers play an important role.
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Affiliation(s)
- Denis Fuentealba
- Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile, Santiago, Chile
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